private String drv = "com.mysql.jdbc.Driver";
private String url = "jdbc:mysql://localhost:3306/demo";
private String usr = "root";
private String pwd = "root";
private Connection conn = null;
private Statement stm = null;
private ResultSet rs = null;
public boolean createConn() {
boolean b = false;
try {
Class.forName(drv).newInstance();
conn = DriverManager.getConnection(url, usr, pwd);
b = true;
} catch (SQLException e) {
} catch (ClassNotFoundException e) {
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {
}
return b;
}
conn始终为空,检查lib下是否有驱动包,如果问题仍然存在,请尝试更换驱动包。
笔者数据库是mysql5.5
原驱动包是mysql-2.0.4.jar
更新到mysql-connection-java-5.1.18-bin.jar问题解决。
数据库connection为null的处理方法
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转载自johndoe.iteye.com/blog/1344913
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